Not a lot has changed here -- but Amazon's given a pretty decent upgrade to the DX, ... If you're a current DX owner, you probably won't feel any need to upgrade, but if you've been thinking about buying one, these improvements might be enough to get you to finally bite.

... its lower price makes it that much more attractive. But prospective buyers will need to consider the trade-off of purchasing this e-reader versus a multipurpose tablet like Apple's $499 iPad.

With a much-larger screen and more storage, the Amazon Kindle DX is a nice addition to the Kindle family. But its almost-$400 price tag might be prohibitively high.

Though it has a hard time competing with Apple's iPad in terms of functionality, the less-expensive 2010 Kindle DX will appeal to those looking for a large, dedicated e-reader with an e-ink display.

This large-screen eReader features an improved display and a lower price, but it still doesn't offer a robust enough experience for students.